Some researchers claim that sponge genomes have homeotic genes, but no Hox genes. If true, how would this impact the phylogenetic tree of animals?
A) sponges must no longer be classified as animals
B) it would confirm the identity of sponges as "basal animals"
C) extinct sponges must have been the last common ancestor of animals and fungi
D) it would require sponges to be reclassified as choanoflagellates

Question

Quizplus · Accepted Answer

The presence of homeotic genes but no Hox genes in sponges supports the idea that they are basal animals, meaning they diverged early in the evolution of the animal lineage. This does not necessitate reclassification outside of animals but rather confirms their position at the base of the animal phylogenetic tree.

Some Researchers Claim That Sponge Genomes Have Homeotic Genes, but No